SDL_audiodev.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
/* Get the name of the audio device we use for output */
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#if defined(unix) || defined(__unix__) || defined(__riscos__)
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#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include "SDL_audiodev_c.h"
#ifndef _PATH_DEV_DSP
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#if defined(__NetBSD__) || defined(__OpenBSD__)
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#define _PATH_DEV_DSP "/dev/audio"
#else
#define _PATH_DEV_DSP "/dev/dsp"
#endif
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#endif
#ifndef _PATH_DEV_DSP24
#define _PATH_DEV_DSP24 "/dev/sound/dsp"
#endif
#ifndef _PATH_DEV_AUDIO
#define _PATH_DEV_AUDIO "/dev/audio"
#endif
int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)
{
const char *audiodev;
int audio_fd;
char audiopath[1024];
/* Figure out what our audio device is */
if ( ((audiodev=getenv("SDL_PATH_DSP")) == NULL) &&
((audiodev=getenv("AUDIODEV")) == NULL) ) {
if ( classic ) {
audiodev = _PATH_DEV_AUDIO;
} else {
struct stat sb;
/* Added support for /dev/sound/\* in Linux 2.4 */
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if ( ((stat("/dev/sound", &sb) == 0) && S_ISDIR(sb.st_mode)) &&
((stat(_PATH_DEV_DSP24, &sb) == 0) && S_ISCHR(sb.st_mode)) ) {
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audiodev = _PATH_DEV_DSP24;
} else {
audiodev = _PATH_DEV_DSP;
}
}
}
audio_fd = open(audiodev, flags, 0);
/* If the first open fails, look for other devices */
if ( (audio_fd < 0) && (strlen(audiodev) < (sizeof(audiopath)-3)) ) {
int exists, instance;
struct stat sb;
instance = 1;
do { /* Don't use errno ENOENT - it may not be thread-safe */
sprintf(audiopath, "%s%d", audiodev, instance++);
exists = 0;
if ( stat(audiopath, &sb) == 0 ) {
exists = 1;
audio_fd = open(audiopath, flags, 0);
}
} while ( exists && (audio_fd < 0) );
audiodev = audiopath;
}
if ( path != NULL ) {
strncpy(path, audiodev, maxlen);
path[maxlen-1] = '\0';
}
return(audio_fd);
}
#elif defined(_AIX)
/* Get the name of the audio device we use for output */
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include "SDL_audiodev_c.h"
#ifndef _PATH_DEV_DSP
#define _PATH_DEV_DSP "/dev/%caud%c/%c"
#endif
char devsettings[][3] =
{
{ 'p', '0', '1' }, { 'p', '0', '2' }, { 'p', '0', '3' }, { 'p', '0', '4' },
{ 'p', '1', '1' }, { 'p', '1', '2' }, { 'p', '1', '3' }, { 'p', '1', '4' },
{ 'p', '2', '1' }, { 'p', '2', '2' }, { 'p', '2', '3' }, { 'p', '2', '4' },
{ 'p', '3', '1' }, { 'p', '3', '2' }, { 'p', '3', '3' }, { 'p', '3', '4' },
{ 'b', '0', '1' }, { 'b', '0', '2' }, { 'b', '0', '3' }, { 'b', '0', '4' },
{ 'b', '1', '1' }, { 'b', '1', '2' }, { 'b', '1', '3' }, { 'b', '1', '4' },
{ 'b', '2', '1' }, { 'b', '2', '2' }, { 'b', '2', '3' }, { 'b', '2', '4' },
{ 'b', '3', '1' }, { 'b', '3', '2' }, { 'b', '3', '3' }, { 'b', '3', '4' },
{ '\0', '\0', '\0' }
};
static int OpenUserDefinedDevice(char *path, int maxlen, int flags)
{
const char *audiodev;
int audio_fd;
/* Figure out what our audio device is */
if ((audiodev=getenv("SDL_PATH_DSP")) == NULL) {
audiodev=getenv("AUDIODEV");
}
if ( audiodev == NULL ) {
return -1;
}
audio_fd = open(audiodev, flags, 0);
if ( path != NULL ) {
strncpy(path, audiodev, maxlen);
path[maxlen-1] = '\0';
}
return audio_fd;
}
int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)
{
struct stat sb;
int audio_fd;
char audiopath[1024];
int cycle;
audio_fd = OpenUserDefinedDevice(path,maxlen,flags);
if ( audio_fd != -1 ) {
return audio_fd;
}
cycle = 0;
while( devsettings[cycle][0] != '\0' ) {
sprintf( audiopath,
_PATH_DEV_DSP,
devsettings[cycle][0],
devsettings[cycle][1],
devsettings[cycle][2]);
if ( stat(audiopath, &sb) == 0 ) {
audio_fd = open(audiopath, flags, 0);
if ( audio_fd > 0 ) {
if ( path != NULL ) {
strncpy( path, audiopath, maxlen );
path[maxlen-1] = '\0';
}
return audio_fd;
}
}
}
return -1;
}
#endif /* UNIX system */